Cam and valve lifter



A. J. ADAM 1,708,749

CAM AND VALVE LIFTER April 9, 1929.

5 Sheets-Sheet l Filed Feb. 21,, 1927 INVCN IQR ATTORNEY A ril 9, 1929.J D 1,708,749

CAM AND VALVE LIFTER Filed Feb. 21, 1927 5 Sheets-Sheet 2 Jflziava,

ATTOR N EY April 9, 1929. A. J. ADAM CAM AND VALVE LIFTER Filed Feb. 21,1927 3 Sheets-Sheet INVENTOR ATTOR N EY .1. Jflziazra,

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latente d Apr. 9, 1929.

UNITED STATES ALEX J. ADAM, OF SAN ANTONIO, TEXAS.

CAM AND VALVE LIFTER,

Application filed February 21, 1927. Serial No. 170,018.

This invention relates to valve mechanisms for internal combustionengines, an object being to provide means tor simplitying theconstruction and operation and reducing the number of working parts of amechanism of this character.

To this end the invention provides means for actuating a pluralityofvalves by a single cam or eccentric, novel means being pro vided foralternately acting upon the intake and exhaust valves of one or morecylinders.

With the above and other objects in view, the invention further includesthe following novel features and details of construction, to behereinafter more fully described, illustrated in the accompanyingdrawings and. pointed out in the appended claim.

In the drawings Figure 1 is a fragmentary scctionaiview illustrating theinvention.

Figure 2 is an enlarged detail. sectional view" showing the valve lifterand contiguous portions of the mechanism illustrated in Figure 1.

Figure 3 is an elevation partly broken away showing the valves of atwo-cylinder engine actuated by a single cam.

Figure 4 an elevation at right angles to Figure 3.

Figures 5 and 6 are side and edge views respectively of the cam shown inFigure 1.

Figures 7 and 8 are side and edge views respectively of acam foractuating a single valve.

Figures 9 and 10 ar side and edge views respectively of the cam shown inFigure Figure 11 is an edge view of the type of cani shown in Figures 5and 6, the cam groove being replaced by a cam bead.

Figure 12 is a fragmentary view showing the end of a valve litter foruse in connection with the cam shown in Figure 11.

Referring to the drawings 7 in detail wherein like characters ofreference denote corresponding parts, the reference character 15indicates the cylinder of an internal coinbustion engine having overheadvalves 16, one of which is an intake and the other an exhaust valve. Theengine crank shaft is shown at 17 and this shaft is provided with theusual crank arms 18 for connection with the rod 19 of a piston 20. i

As is usual in valve mechanisms of this character, the valves arenormally seated by springs 21 and are engaged by rocker arms 22 whichhave connected thereto push .the hearing or guide 25.

Pivotally mounted within the slide 27 upon a pin 29 is a valve litter30, so that the said lifter may be moved longitudinally within thesleeve and may also be moved. upon the pivot 29. The outer end oi? thevalve lifter 30 bifurcated so as to provide spaced arms 31 and mountedbetween these arms is a roller or tracer 32. Secured up on the crankshaft 17 is a cam This cam wh.ich is shown in Figure 1 of the drawingsis illustrated on an enlarged scale in Figures 5 and 6. As shown inthese figures the cam includes oppositely located low portions 34; andsimilarly arranged high portions 35, while double groove 86 extendsaround the cam. Upon one side of the cam the double groove providesparallel grooves 37 as shown in F igure 1, while these double groovescross upon the opposite side of the cam as shown at 38 in Figure 6.

As the cam is revolved by the rotation of the crank shaft, the wheel 32will travel in the double cam groove 36 and when the parts are in theposition shown in Figure 1, one of the rods 23 will be lifted to openits particular valve. As rotation of the cam continues, the wheel 32will pass from the portion oi the groove shown in Figure 1 to theopposite portion, first permitting the valve to seat under the action ofits spring 21. As the wheel passes to the opposite portion of the groove36, the valve lifter will be moved upon its pivot so as to bring itsinner end beneath the other push rod 23 and when the wheel reaches thehigh portion, of the cam, this push rod will be actuated to open theother valve.

The cam shown in Figure 11 is 01 the 1 till ill) from the camillustrated in Figures 5 and 6 in that only one high point is provided,so that instead of actuating a valve at each half revolution, a singlevalve is actuated once in each complete revolution.

- In Figures 3 and 4, a two-cylinder engine is illustrated, eachcylinder having upon opposite sides an intake valve and an exhaustvalve. These valves are indicated at 41. der block is a rocker arm 4-2.This arm is mounted :for pivotal rocking movementlas shown at 4-3 andupon an arm lt and the latter is in turn pivotally mounted shown. at ina bracket 46. The rocker arm 42 is thus capable oi pivotal. rockingmovement to actuate the valves and of lateral pivotal movement for thepurpose of bringing its upper end into alternate engagement with thevalves 41 upon one side of the block. For this purpose, the lower end ofthe rocker arm 42 has a universal connection 47 With a litter 48 whichis mounted and movable after the manner of the lifter shown in Figure2of the drawings. Like the lifter 30, the liiter 48 carries at its innerend a Wheel or roller 49 Which operates in a double cam groove 50provided in a cam 51 which is mounted upon the crank shaft 52 oi? theengine. I

v As the cam 51 is revolved, the litter 48 Will be moved longitudinallyand pivotally after the manner of the lifter 30 and this movement Willcause the rocker arm 42 to be Mounted upon each side of the cylin:

rocked upon its pivot 43 as Well as to be moved laterally upon the pivot45. The

rocker arm Will thus be caused to alternately engage and actuate thevalve upon one side oi the cylinder 'blocle As the mechanism duplicatedupon opposite sides of the cylinder block shown in Figure 3 0f thedrawings, an exhaust valve and an intake valve will be alternatelyoperated in each cylinder ot the'engine by the action ofra single cam.

ne invention details of construction and the right is herein reserved tomake such changes as properly lall Within the scope of the appendedclaim.

7 Having described the invention What is, claimed 1s:

In a valve mechanism for internal combustion engines, normally seatedintake and exhaust valves, push rods operatively associated with thevalves, a bearing sleeve, a'

ALEX J. ADAM.

is susceptible of variouschanges in its iorm, proportions and minor rlmigitudinally and pivotally and alter-

